which electronic configuration has abnormally high difference between 2nd and 3rd ionization enthalpies and why 1s2 2s2 2p6 3s2 or 1s2 2s2 2p6 3s2 3p6
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In the above electronic configuration, after removal of second valence electron from 3s orbital the ion formed achieves noble gas configuration. Therefore, to remove the third electron from 2p orbital, a lot of energy is required. Thus, there is abnormally high difference between second and third ionization enthalpies.
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